断层带岩体采动效应的相似材料模拟研究

STUDY ON SIMILAR MATERIAL FOR SIMULATION OF MINING EFFECT OF ROCK MASS AT FAULT ZONE

以任楼煤矿F3～F4断层间块段地层为原型,建立相似材料模型,对煤层回采过程中断层带岩体的采动效应及断层下盘含水层的突水可能性进行模拟,研究结果表明:在煤层回采过程中,随断层煤柱的减小,断层两盘岩体的变形存在差异性,表现出不同的采动效应特征;当煤柱减小到一定数值后将造成断层上、下盘岩体发生相对位移,导致断层"活化",引发断层导水;承压含水层对断层采动效应也有一定的影响,有促进断层"活化"的作用。因此,在进行断层防水煤柱合理留设过程中,必须充分考虑这些因素的影响,为煤矿安全高效生产提供可靠保障。

Taking the strata of the area between Faults F3 and F4 in the Renlou Coal Mine as the prototype,the similar material model is constructed. The mining effect of the rock mass at fault zone and the possibility of water-inrush from the aquifer of footwall of fault are simulated. The results show that,with reducing the coal pillar,there are differences between the deformation of rock mass of two walls of the fault,and the characteristics of mining effect are different. And when the coal pillar is reduced to a certain value,there is relative movement between the hanging and the foot wall rock mass of the fault and the fault becomes active resulting in water-conducting along the fault. Meanwhile,the confined aquifer influences the mining effect in the fault and promotes the fault to become active. Therefore,in the process of the establishment of water-preventing coal pillar in the fault,the factors must be considered to provide reliable protection for the safe and efficient production of coal mine.